Melville, NY – LSI Computer Systems, Inc. (LSI/CSI) announces the availability of three new high performance stepper motor controller ICs, designated the LS8297, LS8297CT and LS8397. These devices offer half-step and full-step sequences in both normal drive and wave drive modes. In addition, the LS8297CT and the LS8397 offer correction for the torque-ripple. A power saving holding-torque mode is also available in LS8397 for maintaining the drivers at a reduced power level when the motor is not turning. Four phase outputs and two inhibit outputs are provided for driving external H-bridge drivers, allowing for the selection of a standard driver or an application specific custom driver. An external reference voltage, in conjunction with the winding current sense voltages, regulates the PWM duty cycles of the driver outputs. One of two decay modes, fast-decay and slow-decay, can be selected to suit the characteristics of the motor winding.
LS8297 and LS8297CT features include inputs for step, forward/reverse, reset and output blanking control, supply current < 400µA, and supply voltage of 4.5 to 7V. The LS8397 includes a mode for reduced power holding torque.
LS8297 and LS8297CT devices are available in 20-pin DIP, SOIC and TSSOP packages and the LS8397 is available in 24-pin DIP, SOIC and TSSOP packages.